Diagenetic Evolution and Oil-Gas Accumulation from Clastic Rock of Lower Cretaceous in Chagan Depression

YUE Fu sheng; MA Long; LI Tian shu

The discovery of the mature crude oil of low-sulfur and high quality show s prospecting value for oil-gas in Chagan Depression.The clastic rock reservoirs are characterized by low maturities of composition and texture,high contents of rock debris and filling materials, multi-composition of filling materials and multi-ty pe cementation.The selective solution of carbonate cement and the deceleration of layered volcanic rock for the compaction in clastic rock resulted in the development of secondary po res in low-porosi ty and permeability clastic rock.The dist ribution of oil layers in the reservoirs is controlled by the adv antageous sand-body dist ribution in the favorable sedimentary facies zones, the sections where secondary po re developed and the structural type.

1 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;

2 Research Institute of Petroleum Exploration and Development Northwest Branch, Lanzhou 730020

Received Date: 2002-08-21

Rev Recd Date: 2002-10-09

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Abstract: The discovery of the mature crude oil of low-sulfur and high quality show s prospecting value for oil-gas in Chagan Depression.The clastic rock reservoirs are characterized by low maturities of composition and texture,high contents of rock debris and filling materials, multi-composition of filling materials and multi-ty pe cementation.The selective solution of carbonate cement and the deceleration of layered volcanic rock for the compaction in clastic rock resulted in the development of secondary po res in low-porosi ty and permeability clastic rock.The dist ribution of oil layers in the reservoirs is controlled by the adv antageous sand-body dist ribution in the favorable sedimentary facies zones, the sections where secondary po re developed and the structural type.

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Diagenetic Evolution and Oil-Gas Accumulation from Clastic Rock of Lower Cretaceous in Chagan Depression

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